package com.litianhao.nowcode.entity;

/**
 * 封装分页相关的信息
 * @author litianhao
 * @create 2020-05-17 11:04
 */
public class Page {

    //当前的页码
    private int current = 1;

    //显示的上限
    private int limit = 10;

    //数据的总数 用于计算总页数
    private int rows;

    //查询路径  用于复用分页链接
    private String path;

    public int getCurrent() {
        return current;
    }

    public void setCurrent(int current) {
        if(current>=1){
            this.current = current;
        }

    }

    public int getLimit() {
        return limit;
    }

    public void setLimit(int limit) {
        if(limit>=1&&limit<=100){
            this.limit = limit;
        }

    }

    public int getRows() {
        return rows;
    }

    public void setRows(int rows) {
        if(rows>=0){
            this.rows = rows;
        }

    }

    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }

    /**
     * 获取当前页的起始行
     * @return
     */
    public int getOffset(){
        // current*limit-limit
        return (current-1)*limit;
    }

    /**
     * 获取总页数
     */
    public int getTotal(){
        // rows/limit (+1)
        if(rows%limit==0){
            return rows/limit;
        }else{
            return rows/limit+1;
        }
    }

    /**
     * 页码显示的 起始页
     */
    public int getFrom(){
        int from = current -2;
        return from < 1 ? 1 : from;
    }

    /**
     * 页码显示的   终止页
     * @return
     */
    public int getTo(){
        int to = current +2;
        int total = getTotal();
        return to > total ? total : to;
    }
}
